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How can you combine response transformation with exception handling in NestJS to ensure consistent API output?

hard📝 Conceptual Q9 of 15
NestJS - Interceptors
How can you combine response transformation with exception handling in NestJS to ensure consistent API output?
AUse an interceptor that transforms both successful responses and exceptions
BUse a pipe to catch exceptions and transform responses
CUse middleware to handle exceptions and transform responses
DUse guards to transform exceptions into responses
Step-by-Step Solution
Solution:

  1. Step 1: Understand interceptor capabilities

    Interceptors can handle both response transformation and catch exceptions.

  2. Step 2: Differentiate from other features

    Pipes do not handle exceptions, middleware is less suited for response shaping, guards handle authorization.

  3. Final Answer:

    Use an interceptor that transforms both successful responses and exceptions -> Option A

  4. Quick Check:

    Interceptors handle responses and exceptions [OK]
Quick Trick: Interceptors can transform responses and catch exceptions [OK]
Common Mistakes:
  • Using pipes for exception handling
  • Relying on middleware for response shaping
  • Misusing guards for error handling

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